Daily Junction.mobi portalPersonal Finance · June 7, 2026 · James Whittaker · 6 min
Inside IR35 means PAYE tax and no expenses; outside means Ltd Company efficiency. We compare take-home pay, risk, and the 2026 landscape for UK contractors.
If you work as a UK contractor — or are considering it — the three letters that dominate every conversation are I, R, 3, and 5. Whether a contract falls inside or outside IR35 determines how you are taxed, what you can claim, and how much of your day rate actually reaches your pocket. The difference is not marginal: at a £500 day rate, the gap between inside and outside can exceed £12,000 per year in take-home pay. This guide explains what each status means, how the rules work in 2026, and what the real financial impact looks like. This is general information, not tax advice — speak to a qualified accountant.
IR35 is the shorthand for the off-payroll working rules, named after the HMRC press release that introduced them in 2000. The core question is simple: if it were not for your limited company (or other intermediary), would you be considered an employee of the client? If the answer is yes, you are inside IR35 and should be taxed like an employee. If no, you are outside IR35 and can operate through your company with the tax efficiency that entails.
Since April 2021, the responsibility for determining IR35 status in the private sector shifted from the contractor to the end-client (for medium and large businesses). The client must produce a Status Determination Statement (SDS) and take "reasonable care" in reaching its conclusion. If HMRC later finds the determination was wrong, the client — not the contractor — is liable for the unpaid tax. This was a seismic shift, and it has made many large organisations risk-averse: when in doubt, they classify contractors as inside IR35.
Small companies (those meeting two of three criteria: turnover ≤£10.2 million, balance sheet ≤£5.1 million, or ≤50 employees) are exempt — the contractor retains responsibility for determining their own status.
If a contract is inside IR35, the fee-payer (typically an umbrella company or agency) must deduct income tax and National Insurance contributions from your payments before they reach you — exactly as if you were on PAYE.
What this means in practice:
The result is that a significant portion of your day rate is lost to tax and NI before it reaches your bank account.
If a contract is outside IR35, you invoice through your limited company, and the client pays your company gross. You then decide how to extract the money:
You can also claim legitimate business expenses through the company — travel, equipment, training, professional subscriptions, use of home as office, and pension contributions — all of which reduce your corporation tax bill.
Here is what a £500 day rate looks like in 2026–27, assuming 220 chargeable days per year (£110,000 gross):
The difference: roughly £13,000 per year — or over £1,000 per month — in favour of outside IR35. Over a three-year contract, that gap exceeds £39,000.
The financial advantage of outside IR35 is clear, but it comes with responsibilities:
| Factor | Inside IR35 | Outside IR35 |
|---|---|---|
| Tax treatment | PAYE — income tax + employee NI + employer NI deducted at source | Corporation tax on profits + dividend tax on extraction |
| Take-home at £500/day (220 days) | ~£63,250 | ~£76,300 |
| Expenses | Virtually none (no travel/subsistence) | Travel, equipment, training, pension, home office |
| Employment rights | Limited (umbrella worker rights) | None — self-employed |
| Admin burden | Low — umbrella handles everything | Moderate — Ltd Co accounts, filings, payroll |
| Investigation risk | Low (tax paid at source) | Moderate (status can be challenged) |
| Pension contributions | Via umbrella salary sacrifice | Company can contribute up to £60,000/year |
Inside IR35 suits:
Outside IR35 suits:
The financial case for outside IR35 is compelling — a £13,000 annual difference at a £500 day rate is not marginal. But the determination is not yours to make: for medium and large clients, it is the client's call, and many have adopted blanket "inside IR35" policies to eliminate risk.
If you have a genuine outside-IR35 contract, the limited company route is almost certainly the right financial choice. If your client has determined you are inside IR35, you can challenge the SDS through the client's disagreement process, but in practice, many contractors accept the determination and work through an umbrella — the alternative is walking away from the contract.
The key is to understand the working practices that determine status — control, substitution, and mutuality of obligation — and to ensure your contract and your actual day-to-day working arrangements are consistent. A well-drafted contract reviewed by a specialist IR35 solicitor or accountant is worth every penny.
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